The first version of KOffice for Maemo 5 will be ready as soon as the maintenance update for Maemo 5. Fremantle PR1.1 is released. This is because the Maemo 5 KOffice depends on Qt release update which will be availabel in the PR1.1. This should happen as soon as PR1.1 is released.
The Maemo 5 KOffice UI sources itself have been released in Koffice Community project last week so you can get the code base if you interested from the community.
I will blog about the release as soon as we make one here: http://sureshchande.blogspot.com/

Thanks for your patience with this, the team is certainly working hard to get a version of the Koffice on Maemo 5 available as soon as we can. It should first appear in Maemo Extras Devel repository after the PR1.1 release.